A different NMR view of cuprate superconductors

TL;DR

This paper revises earlier NMR-based understandings of cuprate superconductors by identifying two coupled electronic spin components influencing nuclear shifts, revealing complex interactions and family-dependent behaviors.

Contribution

It introduces a revised interpretation of NMR data showing two coupled spin components in cuprates, highlighting their influence on nuclear shifts and relaxation, and discusses doping and temperature effects.

Findings

Identification of two coupled electronic spin components affecting NMR signals

Observation of family-dependent charge sharing between Cu and O

Analysis of doping and temperature dependence of spin interactions

Abstract

Nuclear magnetic resonance (NMR) is a powerful quantum probe, but the early conclusions on the physics of the cuprates, based on a limited set of data, have to be revised in view of recent findings and results from extensive literature analyses of most NMR data. These show two coupled electronic spin components that influence the nuclei, most easily seen with the planar Cu shift anisotropy. One component is spin from the recently identified ubiquitous metallic excitations, the other due to the intrinsic, antiferromagnetically coupled electronic Cu spin. Both components and its intricate interaction leave their imprint on nuclear shifts and relaxation. They also show a family dependence seen in the charge sharing between planar Cu and O. The main phenomena of the doping and temperature dependences of the interplay between both spins components are discussed in terms of an apparent phenomenology that awaits explanation from theory.